Malicious PDF — malware analysis report

Static analysis result for SHA-256 c611df530d4559eb…

MALICIOUS

PDF

43.1 KB Created: 2021-04-29 01:50:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c693086b58b556c73f488a8b9a134efc SHA-1: 165b3de1a258dad32f48dc2a132ae5c4f0f6758e SHA-256: c611df530d4559eb0f4af7a7abfdc5280783433fbb8dc2eef6b7cf9358fb373e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to websites offering 'Roblox hacks' and 'free Robux', which are common lures for malicious content. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. The document body, though partially obfuscated, contains references to these lures and the malicious URL. The primary attack pattern involves tricking users into visiting these sites, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/roblox-hack-script-twisted-murderer-game-hack In PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/roblox-free-robux-freedom.pdfIn PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/free-robux-cript-tamper-monkey.pdfIn PDF document text
    • http://perpustakaan.pn-tilamuta.go.id/repository/como-tener-robux-gratis-hack.pdfIn PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/free-10-dollar-roblox-card.pdfIn PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/best-free-online-games-like-roblox.pdfIn PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/hack-free-codes-roblox.pdfIn PDF document text
    • https://perpustakaan.pn-tilamuta.go.id/repository/christmas-tycoon-roblox-hack-script.pdfIn PDF document text
    • http://perpustakaan.pn-tilamuta.go.id/repository/hacks-for-imillion-robux.pdfIn PDF document text
    • http://perpustakaan.pn-tilamuta.go.id/repository/roblox-three-robux-hack.pdfIn PDF document text
    • http://perpustakaan.pn-tilamuta.go.id/repository/free-roblox-gift-cards-discord.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000043e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43E5 28712 bytes
SHA-256: c4e1e31165c4e0a956556b00f126bb7c3bcaf756cfecdaddf098e217adb5f616
font_01_sfnt_off0000841c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841C 19256 bytes
SHA-256: c671f5aa4b3f680e7a0ba4eed63d8f675a8efe9528e82ec7da51dabb00c832ad

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